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CN111315573B - Laminate for image display device - Google Patents

Laminate for image display device Download PDF

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Publication number
CN111315573B
CN111315573B CN201880070113.5A CN201880070113A CN111315573B CN 111315573 B CN111315573 B CN 111315573B CN 201880070113 A CN201880070113 A CN 201880070113A CN 111315573 B CN111315573 B CN 111315573B
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China
Prior art keywords
adhesive layer
laminate
display device
image display
thickness
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CN201880070113.5A
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Chinese (zh)
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CN111315573A (en
Inventor
村重毅
稻垣淳一
杉野晶子
池田哲朗
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Nitto Denko Corp
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Nitto Denko Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/1044—Invariable transmission
    • B32B17/10458—Polarization selective transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)
  • Surface Treatment Of Glass (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

The invention provides a laminate which has a thin glass film and is excellent in flexibility and puncture resistance. The laminate for an image display device of the present invention comprises: a glass film and a resin layer disposed on one side of the glass film; the thickness of the glass film is greater than 50 μm and less than 150 μm; according to JISZ1707:1997 a puncture strength of more than 2kg and 50kg or less; and the bending radius is 15 mm-200 mm.

Description

Laminate for image display device
Technical Field
The present invention relates to a laminate for an image display device.
Background
In recent years, from the viewpoints of transportability, storability, and design, liquid crystal display elements, display/lighting elements using organic EL, and solar cells have been made lighter and thinner, and development has been advanced to continuous production using a roll-to-roll process. Conventionally, as a method for imparting flexibility to glass at the same time, an extremely thin glass (glass film) has been proposed. Glass films can be wound into rolls and can therefore be processed in a roll-to-roll process. Heretofore, a method of processing a transparent electrode or the like by a roll-to-roll process using glass has been known.
On the other hand, a touch sensing function is added to a display device, particularly a mobile device, a notebook computer, or the like, and durability such as dotting with a pen is required for the outermost layer thereof. In the conventional apparatus, a resin material subjected to a surface treatment of high hardness called hard coating is used as the outermost layer, but sufficient durability cannot be obtained in actual circumstances. In order to improve the strength remarkably, the use of tempered glass called cover glass is increasing. However, the tempered glass has a thickness of 500 μm or more, and is difficult to be applied to devices having a predetermined area or more such as notebook computers and screens because the tempered glass is required to be thin and light. Further, the tempered glass is not suitable because it cannot follow the shape of a curved surface. Meanwhile, attempts have been made to use a thin glass film as the outermost layer. However, since the glass film is thin and easily deformed, there is a problem that the glass film is easily broken when a point is formed on the surface by a sharp projection such as a pen.
Documents of the prior art
Patent literature
Patent document 1: international publication No. 2013-175767
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above conventional problems, and a main object thereof is to provide a laminate having a thin glass film, excellent flexibility, and excellent puncture resistance.
Means for solving the problems
The laminate for an image display device of the present invention comprises: a glass film and a resin layer disposed on one side of the glass film, wherein the glass film has a thickness of more than 50 μm and 150 μm or less, and is formed according to JIS Z1707:1997 a puncture strength of more than 2kg and 50kg or less, and a bending radius of the laminate for an image display device is 15mm to 200mm.
In one embodiment, the laminate for an image display device includes the glass film, an adhesive layer, the resin layer, and an adhesive layer in this order.
In one embodiment, the laminate for an image display device has a strength P represented by the following formula (1) of 500 (10) -4 (μm) 3 (GPa) 2 ) In the above-mentioned manner,
[ mathematical formula 1]
Figure GDA0003860795200000021
In the formula (1), eg represents the elastic modulus of the glass film at 23 ℃, tg represents the thickness of the glass film, ea 1 The elastic modulus at 23 ℃ of the adhesive layer, ta 1 The thickness of the adhesive layer, ep the modulus of elasticity at 23 ℃ of the resin layer, tp the thickness of the resin layer, ea 2 The elastic modulus at 23 ℃ of the pressure-sensitive adhesive layer, ta 2 The thickness of the adhesive layer is shown.
In one embodiment, the resin layer is a polarizing plate.
In one embodiment, the polarizing plate includes: a polarizer and a protective film disposed on one side of the polarizer, wherein the protective film and the polarizer are disposed in this order from the glass film side.
In one embodiment, the resin layer has an elastic modulus of 1.5GPa to 10GPa at 23 ℃.
In one embodiment, the adhesive layer has an elastic modulus of 0.5GPa to 15GPa at 23 ℃.
In one embodiment, the adhesive layer has an elastic modulus of 0.00001GPa to 10GPa at 23 ℃.
In one embodiment, the ratio of the elastic modulus of the adhesive layer at 23 ℃ to the elastic modulus of the adhesive layer at 23 ℃ (elastic modulus of the adhesive layer/elastic modulus of the adhesive layer) is 1 to 1000.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a laminate having a thin glass film, excellent flexibility, and excellent puncture resistance can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view of a laminate for an image display device according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a laminate for an image display device according to another embodiment of the present invention.
Description of the symbols
10. Glass film
20. Adhesive layer
30. Resin layer
30' polarizing plate
31. Protective film
32. Polarizer
40. Adhesive layer
100. Laminate for 200 image display device
Detailed Description
A. Integral structure of laminated body for image display device
Fig. 1 is a schematic cross-sectional view of a laminate for an image display device according to an embodiment of the present invention. The laminate 100 for an image display device includes: a glass film 10, and a resin layer 30 disposed on one side of the glass film 10. The laminate 100 for an image display device preferably further includes an adhesive layer 20 between the glass film 10 and the resin layer 30. The laminate 100 for an image display device preferably further includes an adhesive layer 40 on the side of the resin layer 30 opposite to the glass film 10. In one embodiment, the adhesive layer 20 and the pressure-sensitive adhesive layer 40 may be disposed directly (i.e., without interposing another layer) on the resin layer 30. The adhesive layer 20 may be disposed directly on the glass film 10. In this specification, the adhesive layer refers to a layer that can bond substances by being present between the substances. Therefore, when the adherend attached to the adhesive layer is peeled off, the adhesive layer does not have a practical adhesion force. The pressure-sensitive adhesive layer is a substance that has adhesiveness at normal temperature and can adhere to an adherend with light pressure. Therefore, the adhesive can maintain practical adhesion even after the adherend attached to the adhesive layer is peeled off.
In one embodiment, the resin layer may be a polarizing plate. Fig. 2 is a schematic cross-sectional view of a laminate for an image display device according to another embodiment of the present invention. The laminate 200 for an image display device shown in fig. 2 includes: a glass film 10, and a polarizing plate 30' disposed on one side of the glass film 10. In one embodiment, the polarizing plate 30' includes, as shown in fig. 2: a polarizer 32, and a protective film 31 disposed on at least one side of the polarizer 32. When the protective film 31 is disposed only on one side of the polarizer 32, it is preferable that the protective film 31 and the polarizer 32 are disposed in this order from the glass film 10 side. By disposing the protective film 31 at the above-mentioned position, a laminate for an image display device having excellent puncture strength can be obtained. Protective films may be disposed on both surfaces of the polarizer as necessary. As in the image display device laminate shown in fig. 1, the image display device laminate 200 preferably further includes an adhesive layer 20 between the glass film 10 and the polarizing plate 30'. The laminate 200 for an image display device preferably further includes an adhesive layer 40 on the side of the polarizing plate 30' opposite to the glass film 10. In one embodiment, the adhesive layer 20 and the adhesive layer 40 may be disposed directly (i.e., without interposing another layer) on the polarizer 30'. The adhesive layer 20 may be disposed directly on the glass film 10.
The laminate 100 for an image display device of the present invention has high hardness because of the glass film 10. Further, since the laminate 100 for an image display device of the present invention includes the resin layer 30 (polarizing plate 30') on one side of the glass film 10, the glass film 10 can be prevented from being damaged, and the puncture resistance is excellent. In the present invention, it is presumed that the point compression imparted to the surface (the surface opposite to the polarizer) of the glass film 10 is effectively released to the resin layer 30 side, and thus the glass film has excellent puncture resistance as described above.
The laminate for an image display device of the present invention is produced according to JISZ1707:1997 a puncture strength of more than 2kg and 50kg or less, preferably 4kg to 30kg, more preferably 4kg to 20kg. In such a range, both bendability and puncture strength can be achieved.
The laminate for an image display device of the present invention has a bending radius of 15mm to 200mm, preferably 30mm to 150mm, and more preferably 50mm to 100mm. Within such a range, the above-mentioned effects are remarkable. The "bending radius" can be measured by preparing rods having different outer diameters and bending the laminate for an image display device along the curved surface of the rod. The "bending radius" corresponds to the outer diameter of the rod when the laminate for an image display device is bent to the maximum within a range not to be damaged. The "bend radius" was measured by projecting the glass film (i.e., the glass film was used as the outer side, and the resin layer was used as the inner side).
The thickness of the laminate for an image display device of the present invention is preferably 50 μm to 500. Mu.m, more preferably 100 μm to 400. Mu.m, and still more preferably 120 μm to 300. Mu.m.
In one embodiment, the laminate for an image display device of the present invention has a strength P represented by the following formula (1) of 500 (10) -4 (μm) 3 (GPa) 2 ) The above.
[ mathematical formula 2]
Figure GDA0003860795200000051
In the formula (1), eg represents the elastic modulus of the glass film 10 at 23 ℃, tg represents the thickness of the glass film 10, ea 1 Shows the elastic modulus at 23 ℃ and ta of the adhesive layer 20 1 Denotes the thickness of the adhesive layer 20, ep denotes the elastic modulus of the resin layers 30, 30 'at 23 ℃, tp denotes the thickness of the resin layers 30, 30', ea 2 Shows the elastic modulus at 23 ℃ of the pressure-sensitive adhesive layer 40, ta 2 The thickness of the adhesive layer 40 is indicated.
In one embodiment, when the adhesive layer 20 and the pressure-sensitive adhesive layer 40 are directly disposed on the resin layers 30 and 30 'and the adhesive layer 20 is directly disposed on the glass film 10, the strength P of the laminate composed of the glass film 10/the adhesive layer 20/the resin layers 30 and 30'/the pressure-sensitive adhesive layer 40 is 500 (10) -4 (μm) 3 (GPa) 2 ) The above. Without being limited to a particular theory, it is presumed that the relationship among the outermost glass film, the adhesive layer, the resin layer, and the pressure-sensitive adhesive layer is as follows. As a coefficient of the puncture strength of the glass film, 3 layers of the adhesive layer, the pressure-sensitive adhesive layer, and the resin layer were weighted. The mathematical expression showing the weighting is obtained from the consistency with the experimental results. From the viewpoint of mechanical strength, it is appropriate that the present parameters are defined by the thickness and the modulus of elasticity.
In the present specification, the elastic modulus of the glass film, the resin layer and the adhesive layer can be measured by a universal tester (Autograph) (details will be described later). The elastic modulus of the pressure-sensitive adhesive layer can be measured by a viscoelasticity measuring apparatus (details will be described later).
The laminate for an image display device of the present invention may further comprise another layer. Examples of the other layer include an antireflection layer, an antiglare layer, an antistatic layer, and a conductive layer. A separator may be disposed on the surface of the adhesive layer. The separator can protect the adhesive layer until the laminate for an image display device is ready for use. In one embodiment, no other layer is disposed on the surface of the glass film opposite to the resin layer (i.e., the glass film is exposed). In order to prevent adhesion of foreign matter or the like to the exposed surface of the glass film, any appropriate protective material may be temporarily disposed on the surface of the glass film.
The laminate for an image display device of the present invention can be used for a substrate of a display element of an image display device, and the like. In another aspect of the present invention, there is provided an image display device including the laminate for an image display device. In one embodiment, the laminate for an image display device of the present invention may be disposed on the outermost side of the image display device on the visible side. The laminate for an image display device arranged as described above can function as a front surface protective plate of an image display device.
B. Glass film
Any suitable glass film may be used as the glass film. When the glass film is composed of different components, examples of the glass film include soda lime glass, boric acid glass, aluminosilicate glass, and quartz glass. When the glass is classified into alkali components, examples thereof include alkali-free glass and low-alkali glass. Alkali metal component (e.g., na) of the above glass 2 O、K 2 O、Li 2 O) is preferably 15 wt% or less, more preferably 10 wt% or less.
The thickness of the glass film is preferably 30 to 300. Mu.m, more preferably greater than 50 μm and 300 μm or less, still more preferably 70 to 150 μm, and particularly preferably 80 to 120 μm. When the amount is within this range, a laminate for an image display device which has excellent flexibility, is less likely to cause breakage of the glass film, and has excellent productivity can be obtained.
The glass film preferably has a light transmittance of 85% or more at a wavelength of 550 nm. The refractive index of the glass film at a wavelength of 550nm is preferably 1.4 to 1.65.
The density of the glass film is preferably 2.3g/cm 3 ～3.0g/cm 3 More preferably 2.3g/cm 3 ～2.7g/cm 3 . If the glass film is within the above range, a light-weight laminate for an image display device can be obtained.
Any appropriate method can be used for forming the glass film. Typically, the glass film is obtained by melting a mixture containing a main raw material such as silica or alumina, a defoaming agent such as sodium sulfate or antimony oxide, and a reducing agent such as carbon at a temperature of 1400 to 1600 ℃, forming the mixture into a thin plate, and cooling the thin plate. Examples of the method for forming the glass film include a flow-hole draw-down method, a melting method, and a float method. Since the glass film formed into a plate shape by these methods can be made thin or have improved smoothness, chemical polishing with a solvent such as hydrofluoric acid can be performed as required.
C. Resin layer
Examples of the resin layer include a polarizing plate, a retardation plate, an isotropic film, and a conductive film. The resin film may be a single layer or a multilayer.
Any and suitable material can be used for the material constituting the resin layer. Examples of the material constituting the resin layer include polyolefin-based resins, cycloolefin-based resins, polycarbonate-based resins, cellulose-based resins, polyester-based resins, polyamide-based resins, polyimide-based resins, polyether-based resins, polystyrene resins, (meth) acrylic urethane-based resins, polysulfone resins, acetate-based resins, epoxy-based resins, silicone-based resins, polyarylate-based resins, polysulfone-based resins, polyetherimide-based resins, epoxy-based resins, urethane-based resins, silicone-based resins, polyvinyl alcohol (PVA) -based resins, and the like.
The thickness of the resin layer is preferably 25 to 300. Mu.m, more preferably 30 to 250. Mu.m, still more preferably 50 to 200. Mu.m, and particularly preferably 50 to 100. Mu.m.
The resin layer preferably has an elastic modulus at 23 ℃ of 2GPa to 10GPa, more preferably 2GPa to 5GPa, and still more preferably 2GPa to 4GPa. When the content is in such a range, a laminate for an image display device having excellent puncture resistance can be obtained.
C-1. Polarizer
In one embodiment, the resin layer is a polarizing plate, as described above. The polarizing plate includes a polarizer and a protective film disposed on at least one side of the polarizer. The thickness of the polarizing plate is preferably 5 μm to 300. Mu.m, more preferably 10 μm to 250. Mu.m, still more preferably 25 μm to 200. Mu.m, and particularly preferably 25 μm to 100. Mu.m.
C-1-1 polarizer
The thickness of the polarizer is not particularly limited, and an appropriate thickness may be used according to the purpose. The thickness is typically about 1 μm to 80 μm. In one embodiment, a thin polarizer can be used, and the thickness of the polarizer is preferably 20 μm or less, more preferably 15 μm or less, still more preferably 10 μm or less, and particularly preferably 6 μm or less. By using the thin polarizer, a thin laminate for an image display device can be obtained.
The polarizer preferably exhibits dichroism of absorption at any wavelength of 380nm to 780 nm. The monomer transmittance of the polarizer is preferably 40.0% or more, more preferably 41.0% or more, still more preferably 42.0% or more, and particularly preferably 43.0% or more. The degree of polarization of the polarizer is preferably 99.8% or more, more preferably 99.9% or more, and still more preferably 99.95% or more.
The polarizer is preferably an iodine polarizer. More specifically, the polarizer may be formed of a film of polyvinyl alcohol resin containing iodine (hereinafter referred to as "PVA resin").
As the PVA-based resin forming the PVA-based resin film, any and appropriate resin can be used. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymer. Polyvinyl alcohol can be obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer can be obtained by saponifying an ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. The degree of saponification can be determined in accordance with JIS K6726-1994. By using a PVA-based resin having such a saponification degree, a polarizer having excellent durability can be obtained. When the degree of saponification is too high, gelation may occur.
The average polymerization degree of the PVA-based resin may be appropriately selected depending on the purpose. The average degree of polymerization is usually 1000 to 10000, preferably 1200 to 5000, more preferably 1500 to 4500. The average polymerization degree can be determined in accordance with JIS K6726-1994.
Examples of the method of manufacturing the polarizer include: a method (I) of stretching and dyeing a PVA resin film monomer; and (II) a method of stretching and dyeing the laminate (i) comprising the resin base material and the polyvinyl alcohol resin layer. The method (I) is a conventional method known in the art, and thus, a detailed description thereof will be omitted. The production method (II) preferably includes the steps of: a laminate (i) comprising a resin base material and a polyvinyl alcohol resin layer formed on one side of the resin base material is stretched and dyed, and a polarizer is produced on the resin base material. The laminate (i) can be formed by applying a coating liquid containing a polyvinyl alcohol resin on a resin base material and drying the coating liquid. The laminate (i) may be formed by transferring a polyvinyl alcohol resin film onto a resin substrate. The details of the above-mentioned production process (II) are described in, for example, japanese patent laid-open No. 2012-73580, which is incorporated herein by reference.
C-1-2 protective film
Any and suitable resin film may be used as the protective film. Examples of the material for forming the protective film include: polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as norbornene resins, olefin resins such as polyethylene and polypropylene, and (meth) acrylic resins. Among them, polyethylene terephthalate (PET) is preferable. The term "(meth) acrylic resin" means an acrylic resin and/or a methacrylic resin.
In one embodiment, the (meth) acrylic resin is a (meth) acrylic resin having a glutarimide structure. (meth) acrylic resins having a glutarimide structure (hereinafter, also referred to as "glutarimide resins") are described, for example, in the following documents: japanese patent application laid-open Nos. 2006-309033, 2006-317560, 2006-328329, 2006-328334, 2006-337491, 2006-337492, 2006-337493, 2006-337569, 2007-009182, 2009-161744, and 2010-284840. The present specification incorporates by reference these statements.
The protective film and the polarizer are laminated via an arbitrary and appropriate adhesive layer. The resin base material used in the production of the polarizer may be peeled off before or after the protective film and the polarizer are laminated.
The thickness of the protective film is preferably 4 to 250. Mu.m, more preferably 5 to 150. Mu.m, still more preferably 10 to 100. Mu.m, and particularly preferably 10 to 50 μm.
The protective film preferably has an elastic modulus at 23 ℃ of 1GPa to 10GPa, more preferably 2GPa to 7GPa, and still more preferably 2GPa to 5GPa. When the content is within such a range, a laminate for an image display device having excellent puncture resistance can be obtained. In the present specification, the elastic modulus of the protective film can be measured using a universal tester (Autograph) (details will be described later).
D. Adhesive layer
The adhesive layer may be formed of any appropriate adhesive. Examples of the adhesive include polyester adhesives, polyurethane adhesives, polyvinyl alcohol adhesives, and epoxy adhesives. Among them, epoxy adhesives are preferable. This is because good adhesion can be obtained.
When the adhesive is a thermosetting adhesive, the adhesive can exhibit peeling resistance by hardening (curing) by heating. In the case of a photocurable adhesive such as an ultraviolet-curable adhesive, the adhesive can exhibit peel resistance by being cured by irradiation with light such as ultraviolet light. When the adhesive is a moisture-curable adhesive, it can be cured by reacting with moisture in the air, and therefore, it can be cured by merely leaving it to stand to exhibit peeling resistance.
For example, a commercially available adhesive may be used as the adhesive, or an adhesive solution (or dispersion) may be prepared by dissolving or dispersing various curable resins in a solvent.
The thickness of the adhesive layer is preferably 1 to 30 μm, more preferably 1 to 20 μm, and still more preferably 5 to 10 μm. When the content is within such a range, a laminate for an image display device having excellent flexibility and excellent puncture resistance can be obtained.
The elastic modulus of the adhesive layer at 23 ℃ is preferably 0.5GPa to 15GPa, more preferably 0.8GPa to 10GPa, and still more preferably 1GPa to 5GPa. When the content is within such a range, a laminate for an image display device having excellent flexibility and excellent puncture resistance can be obtained.
The ratio of the elastic modulus of the adhesive layer at 23 ℃ to the elastic modulus of the adhesive layer at 23 ℃ (elastic modulus of the adhesive layer/elastic modulus of the adhesive layer) is preferably 1 to 1000, and more preferably 10 to 500. When the content is within such a range, a laminate for an image display device having excellent puncture resistance and excellent puncture strength can be obtained.
E. Adhesive layer
The pressure-sensitive adhesive layer may be formed of any suitable adhesive. As the binder, for example, a binder having a polymer such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer as a base polymer can be used. Acrylic adhesives are preferably used. This is because the acrylic pressure-sensitive adhesive is excellent in optical transparency, can exhibit appropriate adhesion characteristics such as wettability, cohesiveness and adhesiveness, and is excellent in weather resistance and heat resistance. Particularly preferred is an acrylic adhesive comprising an acrylic polymer having 4 to 12 carbon atoms.
The thickness of the pressure-sensitive adhesive layer is preferably 1 to 100. Mu.m, more preferably 3 to 80 μm, and still more preferably 3 to 50 μm. When the content is within such a range, a laminate for an image display device having excellent flexibility and excellent puncture resistance can be obtained.
The elastic modulus of the pressure-sensitive adhesive layer at 23 ℃ is preferably 0.00001GPa to 10GPa, more preferably 0.001GPa to 8GPa, and still more preferably 0.001GPa to 5GPa. When the content is within such a range, a laminate for an image display device having excellent flexibility and excellent puncture resistance can be obtained. The method of measuring the elastic modulus of the pressure-sensitive adhesive layer is described later.
In one embodiment, when the thickness of the glass film is 70 μm or more, the elastic modulus of the adhesive layer at 23 ℃ is preferably 0.00001 to 1GPa, and more preferably 0.00001 to 0.1GPa. In another embodiment, when the thickness of the glass film is less than 70 μm, the elastic modulus of the adhesive layer at 23 ℃ is preferably 0.5GPa to 8GPa, and more preferably 1GPa to 4GPa. By adjusting the elastic modulus of the pressure-sensitive adhesive layer according to the thickness of the glass film, a laminate for an image display device having excellent flexibility and excellent puncture resistance can be obtained.
F. Others (C)
In the present invention, in order to make the device according to JISZ1707:1997 a puncture strength of more than 2kg and not more than 50kg and a bend radius of 15mm to 200mm, can be achieved by appropriately combining the elements described in the above items B to E, and can be successfully achieved by, for example, the following embodiments.
Embodiment mode (1)
When the thickness of the glass film is 30 μm or more and 60 μm or less, the elastic modulus of the adhesive layer at 23 ℃ is 1GPa or more and 5GPa or less, the thickness of the polarizing plate is 25 μm or more and 200 μm or less, the thickness of the adhesive layer is 3 μm or more and 50 μm or less, and the elastic modulus of the adhesive layer at 23 ℃ is 1GPa or more and 4GPa or less, thereby producing a laminate for an image display device.
Embodiment mode (2)
When the thickness of the glass film is 70 μm to 120 μm, the elastic modulus of the adhesive layer at 23 ℃ is 1GPa to 5GPa, the thickness of the polarizing plate is 25 μm to 200 μm, the thickness of the adhesive layer is 3 μm to 50 μm, and the elastic modulus of the adhesive layer at 23 ℃ is 0.00001GPa to 0.1GPa, thereby producing the laminate for an image display device.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the examples, "part(s)" and "%" are based on weight unless otherwise specified.
Production example 1 preparation of polarizing plate A
(preparation of polarizing mirror)
First, a laminate in which a PVA layer having a thickness of 9 μm was formed on an amorphous PET substrate was subjected to auxiliary stretching in a gas atmosphere at a stretching temperature of 130 ℃ to produce a stretched laminate, and then the stretched laminate was dyed to produce a colored laminate, and then the colored laminate was stretched in an aqueous boric acid solution at a stretching temperature of 65 ℃ to integrally stretch the amorphous PET substrate with the colored laminate, thereby setting the total stretching ratio to 5.94 times and producing an optical film laminate including a PVA layer having a thickness of 4 μm. An optical film laminate comprising a PVA layer having a thickness of 4 μm for constituting a high-function polarizer can be produced, in which PVA molecules formed in the PVA layer of the amorphous PET substrate are highly oriented by such 2-stage stretching, and iodine adsorbed by dyeing is highly oriented in one direction in the form of a multi-iodide complex.
(preparation of acrylic film)
Methacrylic resin pellets having glutarimide ring units were dried at 100.5kPa and 100 ℃ for 12 hours, and extruded from a T die at a die temperature of 270 ℃ by a single screw extruder to be formed into a film shape. The film was stretched in a gas atmosphere at 10 ℃ higher than the Tg of the resin in the carrying direction (MD direction), and then in a gas atmosphere at 7 ℃ higher than the Tg of the resin in the direction orthogonal to the film carrying direction (TD direction), to obtain an acrylic film having a thickness of 40 μm.
(preparation of curable adhesive)
35 parts by weight of N-hydroxyethylacrylamide HEAA (manufactured by Xinjiang Co., ltd.), 45 parts by weight of N-acryloylmorpholine ACMO (manufactured by Xinjiang Co., ltd.), 25 parts by weight of polypropylene glycol diacrylate TPGDA (manufactured by Toyo Seisakusho Co., ltd. "trade name" ARONIX M-220), 3 parts by weight of a photopolymerization initiator (manufactured by Ciba Specialty Chemicals Co., ltd., trade name "IRGACURE 184"), and 1.5 parts by weight of another photopolymerization initiator (manufactured by Nippon chemical Co., ltd., trade name "KAYACURED TX-S") were added as an adhesive.
(preparation of polarizing plate)
The curable adhesive was applied to the polarizer formed on the PET film to a thickness of about 1 μm. Next, the acrylic film of 40 μm was bonded to the adhesive layer. Peak UV illuminance was irradiated from the PET film side by a conveyor belt type UV irradiation apparatus (manufactured by fusion corporation); 1600mW/cm 2 UV cumulative light amount; 1000mJ/cm 2 (wavelength 380-440 nm) ultraviolet rays, curing the adhesive, and further drying at 70 ℃ for 2 minutes. Finally, the PET film was peeled from the laminate in which the acrylic film, polarizer and PET film were laminated, thereby obtaining a laminate of the acrylic film (protective film) and polarizer (polarizing plate a having a thickness of 44 μm).
Production example 2 preparation of polarizing plate B
A polyvinyl alcohol film (PVA) having a thickness of 80 μm was dyed between rolls having different speed ratios at 30 ℃ for 1 minute in a 0.3% iodine solution and stretched 3-fold. Thereafter, the resultant was immersed in an aqueous solution containing 4% boric acid and 10% potassium iodide at 60 ℃ for 0.5 minute, and simultaneously stretched to a total stretching ratio of 6. Subsequently, the plate was immersed in an aqueous solution containing potassium iodide at a concentration of 1.5% at 30 ℃ for 10 seconds to wash the plate, and then dried at 50 ℃ for 4 minutes to obtain a polarizer having a thickness of 20 μm. A triacetyl cellulose film (TAC) having a thickness of 40 μm after the saponification treatment was bonded to each of both surfaces of the polarizer using a polyvinyl alcohol adhesive, and a norbornene-based film having a thickness of 33 μm was bonded to the other surface, thereby obtaining a polarizing plate B (thickness: 93 μm).
Production example 3 preparation of polarizing plate C
A polarizing plate C (thickness: 137 μm) was obtained in the same manner as in production example 2, except that the TAC film thickness was 100 μm and the polarizer thickness was 4 μm.
Production example 4 preparation of polarizing plate D
A TAC film (thickness: 100 μm) was bonded to the surface of the polarizer of the polarizing plate a prepared in production example 1, which was opposite to the acrylic film (protective film), via an adhesive layer (thickness: 5 μm) made of an adhesive prepared in production example 7 described below, to obtain a polarizing plate D (thickness: 149 μm) made of an acrylic film/polarizer/TAC film.
Production example 5 preparation of polarizing plate E
On the surface of the polarizer of the polarizing plate a prepared in production example 1 opposite to the acrylic film (protective film), a TAC film (thickness: 100 μm) was bonded via an adhesive layer (thickness: 20 μm) made of an adhesive prepared in production example 6 below, to obtain a polarizing plate E (thickness: 164 μm) made of an acrylic film/polarizer/TAC film.
Production example 6 preparation of adhesive
(preparation of acrylic Polymer)
In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen introduction tube and a condenser, 100 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid and 0.075 part by weight of 2-hydroxyethyl acrylate, 0.2 part by weight of 2,2' -azobisisobutyronitrile as a polymerization initiator and 200 parts by weight of ethyl acetate as a polymerization solvent were charged, and after sufficient nitrogen substitution, the mixture was stirred under a nitrogen stream while maintaining the liquid temperature in the flask at around 55 ℃, and polymerization was carried out for 10 hours to prepare an acrylic polymer solution. The weight average molecular weight of the acrylic polymer was 220 ten thousand.
(preparation of adhesive composition)
An acrylic adhesive (solid content 10.9 wt%) was prepared by uniformly mixing and stirring 0.2 wt% of dibenzoyl peroxide (NYPER BMT, manufactured by japan fat and oil company) as a peroxide, 0.05 wt% of diglycidyl aminomethylcyclohexane (TETRAD C, manufactured by mitsubishi gas chemical company) as an epoxy crosslinking agent, 0.1 wt% of trimethylolpropane/tolylene diisocyanate adduct (Nippon Polyurethane Industry co., ltd., manufactured by Coronate L) as an isocyanate crosslinking agent, and 0.075 wt% of a silane coupling agent (KBM, manufactured by shin-Etsu chemical Industry).
Production example 7 preparation of adhesive
(preparation of epoxy adhesive)
An epoxy adhesive was prepared by mixing 70 parts by weight of CELLOXIDE 2021P (manufactured by Daicel chemical industries, ltd.), 3150 parts by weight of EHPE, 19 parts by weight of ARON OXETANE OXT-221 (manufactured by Toyo Seisaku Co., ltd.), 4 parts by weight of KBM-403 (manufactured by shin-Etsu chemical industries, ltd.), and 2 parts by weight of CPI101A (manufactured by San-Apro Co., ltd.).
[ example 1]
A glass film (trade name "OA-10G" manufactured by Nippon Denko Co., ltd., thickness: 100 μm) was bonded to the polarizing plate A produced in production example 1 via an adhesive layer (thickness: 5 μm) made of the adhesive prepared in production example 7. In this case, the polarizing plate a is disposed so that the protective film is on the glass film side. Then, the adhesive layer was irradiated with ultraviolet rays (500 mJ/cm) by a high-pressure mercury lamp 2 ) And curing the adhesive layer.
Further, an adhesive layer (thickness: 20 μm) composed of the adhesive prepared in production example 6 was formed on the polarizer side, to obtain a laminate for an image display device.
Further, the adhesive layer is formed as follows. (i) Coating on a polyethylene terephthalate film (manufactured by Mitsubishi chemical polyester film Co., ltd., thickness: 38 μm) after silicone treatment, and heating at 155 ℃ for 1 minute to form an adhesive layer having a thickness of 20 μm after drying; (ii) The pressure-sensitive adhesive layer was transferred from the polyethylene terephthalate film to a polarizer, and a laminate for an image display device having a pressure-sensitive adhesive layer was obtained.
[ example 2]
A laminate for an image display device was obtained in the same manner as in example 1, except that the polarizing plate B was used instead of the polarizing plate a.
[ example 3]
A laminate for an image display device was obtained in the same manner as in example 1, except that the polarizing plate C was used instead of the polarizing plate a.
[ example 4]
A laminate for an image display device was obtained in the same manner as in example 1, except that the polarizing plate D was used instead of the polarizing plate a. The polarizing plate D is disposed so that the TAC film is on the glass film side.
[ example 5]
An image display device laminate was obtained in the same manner as in example 2 except that a glass film (trade name "OA-10G", thickness: 70 μm, manufactured by Nippon electric glass Co., ltd.) was used in place of the glass film (trade name "OA-10G", thickness: 100 μm, manufactured by Nippon electric glass Co., ltd.).
Comparative example 1
A laminate for an image display device was obtained in the same manner as in example 1 except that a glass film (trade name "OA-10G", thickness: 50 μm, manufactured by Nippon electric glass Co., ltd.) was used in place of the glass film (trade name "OA-10G", thickness: 100 μm, manufactured by Nippon electric glass Co., ltd.).
Comparative example 2
A laminate for an image display device was obtained in the same manner as in comparative example 1, except that the polarizing plate B was used instead of the polarizing plate a.
Comparative example 3
A laminate for an image display device was obtained in the same manner as in comparative example 1, except that the polarizing plate C was used instead of the polarizing plate a.
Comparative example 4
A glass film (trade name "OA-10G", thickness: 100 μm, manufactured by Nippon electric glass Co., ltd.), an adhesive layer (thickness: 20 μm) composed of the adhesive prepared in production example 6, a polarizing plate A, and an adhesive layer (thickness: 20 μm) composed of the adhesive prepared in production example 6 were laminated in this order to obtain a laminate for an image display device. The polarizing plate a is disposed so that the protective film is on the glass film side.
Comparative example 5
A laminate for an image display device was obtained in the same manner as in comparative example 4 except that a glass film (trade name "OA-10G", thickness: 200 μm, manufactured by Nippon electric glass Co., ltd.) was used in place of the glass film (trade name "OA-10G", thickness: 100 μm, manufactured by Nippon electric glass Co., ltd.).
Comparative example 6
A glass film (trade name "OA-10G", thickness: 50 μm, manufactured by Nippon electric glass Co., ltd.), a pressure-sensitive adhesive layer (thickness: 20 μm) composed of the pressure-sensitive adhesive prepared in production example 6, a TAC film (thickness: 100 μm), and a pressure-sensitive adhesive layer (thickness: 20 μm) composed of the pressure-sensitive adhesive prepared in production example 6 were laminated in this order to obtain a laminate for an image display device.
Comparative example 7
A TAC film (thickness 100 μm), the adhesive layer (thickness: 20 μm) composed of the adhesive prepared in production example 6, the polarizing plate E, and the adhesive layer (thickness: 20 μm) composed of the adhesive prepared in production example 6 were stacked in this order to obtain a laminate for an image display device. The polarizing plate E is disposed so that the TAC film is on the glass film side.
< evaluation >
The laminates for image display devices obtained in examples, comparative examples and reference examples were subjected to the following evaluations. The results are shown in Table 1.
1. Modulus of elasticity
(modulus of elasticity of adhesive layer)
The storage modulus of the adhesive layer at 23 ℃ was measured using an apparatus for measuring viscoelasticity ARES (TA Instruments Co., ltd.). That is, the adhesive layer was formed into a sheet having a thickness of 2mm, aligned with parallel plates having a diameter of 25mm, punched out, and mounted on a chuck of the apparatus. Then, while applying strain at a cycle of 1Hz, the temperature was increased from-70 ℃ to 150 ℃ at a temperature increase rate of 5 ℃/min, and the storage modulus was measured at 23 ℃.
(elastic modulus of adhesive layer, polarizing plate, resin layer, glass film)
A long sample having a thickness of 50 μm, a width of 2cm and a length of 15cm was prepared, and the elastic modulus was measured from the elongation and stress in the longitudinal direction of the long sample using a universal tester (Autograph) (AG-I, manufactured by Shimadzu corporation). The test conditions were such that the distance between chucks was 10cm and the drawing speed was 10mm/min.
2. Flexibility of the film
20 to 100mm vinyl chloride rods having different outer diameters were prepared at intervals of 10mm in radius. The bending test was performed as follows: the bend radius was measured by using a sample along the shaft with the glass film side (the outermost TAC film side in comparative examples 7 and 8) as the outer side, and using CELLOTAPE (registered trademark) manufactured by NICIBAN corporation (CT 405AP-24 adhesive force 3.93N/10 cm), and confirming the degree of bending depending on whether both sides were fixed or whether the film was broken. The sample size was set to 20mm on the short side and the radius of the outer diameter of the rod on the long side.
3. Method for evaluating puncture strength
A laminate of 5cm was attached to a glass plate to prepare an evaluation sample. A film puncture test jig (TKS-20N/250N (JIS Z1707:1997, manufactured by IMADA) was attached to an electric vertical force measuring instrument holder (manufactured by SHIPO, japan electric Co., ltd.), and the sample was set on a stage for evaluation, and then the sample was punctured at a speed of 20mm/min with a puncture rod (Φ 0.5 mm), and the puncture strength was measured by a force measuring instrument by measuring the indentation load at the time of glass breakage.
4. Hardness of pencil
The pencil hardness of the laminate for an image display device on the side opposite to the adhesive layer (i.e., the glass film surface or the TAC film surface) was measured in accordance with the pencil hardness test of JIS K5600-5-4 (wherein the load was 500 g).
5. Intensity P
The intensity P described in the above item a is calculated.
TABLE 1
Figure GDA0003860795200000171

Claims (5)

1. A laminate for an image display device, comprising a glass film, an adhesive layer, a resin layer and an adhesive layer in this order,
the thickness of the glass film is more than 50 μm and 150 μm or less,
wherein the elastic modulus of the adhesive layer at 23 ℃ is 0.5GPa to 15GPa, the elastic modulus of the adhesive layer at 23 ℃ is 0.00001GPa to 10GPa, and the ratio of the elastic modulus of the adhesive layer at 23 ℃ to the elastic modulus of the adhesive layer at 23 ℃, i.e. the elastic modulus of the adhesive layer/the elastic modulus of the adhesive layer is 1 to 1000,
according to JISZ1707:1997 the puncture strength of the laminate for an image display device is more than 2kg and not more than 50kg,
the laminate for an image display device has a bending radius of 15mm to 200mm.
2. The laminate for image display device according to claim 1,
the intensity P represented by the following formula (1) was 500 (10) -4 (μm) 3 (GPa) 2 ) In the above-mentioned manner,
Figure FDA0003860795190000011
in the formula (1), eg represents the elastic modulus of the glass film at 23 ℃, tg represents the thickness of the glass film, ea 1 Showing the elastic modulus at 23 ℃ of the adhesive layer, ta 1 Denotes the thickness of the adhesive layer, ep denotes the elastic modulus of the resin layer at 23 ℃, tp denotes the thickness of the resin layer, ea 2 Denotes the elastic modulus at 23 ℃ of the adhesive layer, ta 2 Indicates the thickness of the adhesive layer.
3. The laminate for image display device according to claim 1 or 2,
the resin layer is a polarizing plate.
4. The laminate for image display device according to claim 3,
the polarizing plate comprises a polarizer and a protective film disposed on one side of the polarizer,
the protective film and the polarizer are arranged in this order from the glass film side.
5. The laminate for image display device according to claim 1 or 2,
the resin layer has an elastic modulus of 2GPa to 10GPa at 23 ℃.
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